John whittle



Patented Apr; I8, 1899.

' J. WHITTLE.

FURNACE noon. (Application filed Jum sae, 1897.)

(No maul) lizuen'li 'mumn. wunmrnou. o c.

PATENT tries,

JOHN WHITTLE, on BOSTON, ENGLAND.

FURNACE-DOOR.

SPECIFICATION forming part of Letters Patent No. 623,452, dated April 18,1899.

Application filed June 28, 1897. Serial No. 642.745. (N0 model.)

To to whom, it ntcty concern.-

, Be it known that 1, JOHN WHITTLE, a subject of the Queen of Great Britain, residing at 27 Frampton Place, Boston, county of Lincoln, England, have invented a certain new and useful Improvement in Furnace-Doors, (patented in Great Britain, No. 21,524, September 29, 1896,) of which the following is a specification.

This invention relates to furnace-doors, and more particularly to furnace-doors employed in connection with locomotive types of boilerfurnaces; and it has for its object to so 0011- struct and arrange the door as to improve an d render more complete the combustion of the fuel and increase its heat-giving properties.

To this end my invention consists in the features and in the construction, combination, and arrangement of parts hereinafter described, and particularly pointed out in the claims following the description, reference being had to the accompanying drawings, forming a part of this specification, wherein- Figure 1 is a view in front elevation of my improved furnace-door and its attached parts. Fig. 2 is a view in end elevation, partly in section; and Fig. 3 is a top plan view of the same.

The reference-letter A indicates the frame of a furnace-door of a locomotive type of firebox. This door is on a hinge B and is of somewhat oval form, with an oval opening 0, across the long horizontal portion of which is hung a frame I) by ears or socket-plates E E to enable said frame to be set by means of its handle F at any desired angle and be held temporarily by a pawl G, engaging one of the teeth of a rack H, projecting from a deflector-plate I, which for the purpose of my invention can be slid up or down in the frame D, said plate I being arranged to be set at the desired angle. when adjusted by hand.

The plate I, not less than one-half inch thick, can be raised and lowered by its handle K to deflect the inflowing air on the fuel of the furnace to maintain an incandescent heat with no escape of smoke from the fire, the admixture of the air (heated) with the gases arising from the fuel being so intimately associated that perfect .combustion takes place with a full development of heat within the fire-box and while passing through the tubes to the smoke-box.

My combined furnace-door and deflectorplate is of importance not only forthe deflection of air at the desired part of and on the fuel, but by canting the deflector-plate the firing can be followed without opening the fire-door. Noris it necessary to openthe door during the raking operation with fire-irons or raking-tool.

In order that my affixable and adjustable deflector-plate may be as wide as possible, I dispense with the usual horizontal catch, and I arrange a vertically-acting catch L with a scrol-handle M to enable the release of the nose of the catch from the catclrplate N to be effected by hand instead of the catch being raised by chain, as at present.

The top opening between the door and the deflector-plate is of importance, because it enables a fresh supply of oxygen to enter at the upper part of the fire-box, and this by commingling with the uprising highly-heated gases causes the heat to be raised to the highest possible temperature as they travel through the tubes, and this heat is transmitted to the water surrounding the tubes, whereby great economy is obtained, besides which the fire is kept more steady and is not affected, as at present, by the inrush of air through the ash-pan under bottom of fire-box.

WVhat I claim, and desire to secure by Letters Patent, is-

1.. The combination with a furnace-door A having an aperture 0 therein for the introduction of fuel and the ingress of air, of a swinging box D pivotally suspended in said aperture, a deflecting-plate I adjustably projecting through said box into the fire-box, -means for rocking said plate and box about the pivotal support of the latter, and means for holding the plate in its adjusted positions, substantially as described.

2. The combination with a-furnace-doorA having an aperture 0 therein for the introduction of fuel and the ingress of air, of a swinging box D pivotally suspended in said aperture, a deflecting-plate I adjustably projecting through 'said box into the fire-box,-a rack H carried by the plate I, and a pawl G pivoted to the door A and arranged to engage said rack and hold the plate in its adjusted position, substantially as described.

, 3. The combination with a furnace-door A having an elongated aperture C therein for the 5 introduction of fuel and ingress of air, the major axis of said aperture extending horizontally through the o en ter of the door, of a swing in g box D pivotall y suspended in said aperture between the top and bottom of the latter, a de- I0 fleeting-plate I adj ustably projecting through said box into the fire-box, and means for holding the plate in its adjusted position, substantially as described.

In testimony whereof I have hereunto set my hand in presence of tWo subscribing witl 5 nesses.

JOHN YVHITTLE.

Witnesses:

RICHARD CORE GARDNER, WM. 0. BROWN. 

